Ashcroft 82140 Pressure Gauge 3.5 in Dial Npt Center Back

Product Description

The ASHCROFT 82140 is an analog pressure gauge designed for measuring both positive pressure and vacuum in a single instrument. With a 3.5-inch dial and a pressure range of -30 inches Hg to 150 psi, it covers compound measurement applications common in HVAC, plumbing, and industrial service work. The stainless steel case provides durability in demanding environments. A 1/4-inch NPT center back mount connection allows direct installation into threaded ports on equipment and piping. Accuracy is rated at 1 percent of full scale. This gauge is non-liquid-filled and suited for stable, low-vibration installations.

This gauge is used in residential and commercial applications where technicians need to monitor both vacuum and positive pressure from a single instrument. Typical scenarios include refrigeration evacuation verification, HVAC system pressure checks, plumbing pressure testing, and general mechanical service where a compact, panel-ready gauge is required. The center back mount configuration keeps the dial face flush and readable when mounted to panels or manifolds.

Key Features

• Compound range from -30 inches Hg vacuum to 150 psi positive pressure on a single dial
• 3.5-inch analog dial for clear, at-a-glance reading during service
• Stainless steel case construction for corrosion resistance in field conditions
• 1/4-inch NPT center back mount for direct in-line or panel installation
• 1 percent of scale accuracy for reliable readings across the full range
• Non-liquid-filled design suited for low-vibration service environments

Compatibility

Designed as a direct-fit replacement or upgrade for standard 3.5-inch dial compound pressure gauges with 1/4-inch NPT center back mount connections in HVAC, plumbing, and mechanical system applications.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with applicable codes. Shut down and depressurize the system fully before removing or installing the gauge. Apply thread sealant appropriate for the service medium to the NPT threads, and avoid over-tightening to prevent case or fitting damage. Non-liquid-filled gauges should be installed in locations with minimal vibration to maintain accuracy and service life.